Why do Qiang houses have four corners?

Because of the architectural style and cultural tradition of Qiang folk houses. Qiang people's houses are all built on the hillside. In order to adapt to the terrain, the building needs strong stability and firmness, so it needs to be strengthened at four corners to ensure the stability of the building. Qiang folk houses are one of the traditional folk houses in China, with unique architectural forms, and are often called "quadrangles". This house form usually consists of four independent buildings, each with an independent entrance, forming a central courtyard.